Pinebook GPU

[Robert Swindells <rjs%fdy2.co.uk@localhost>]

I think I am making a bit of progress with the DRM driver for the
Pinebook.

lima0 at simplebus1lima_attach: mapping 10000 at 1c40000
lima0: autoconfiguration error: error: mmu ppmmu2 dte write test fail
lima0: autoconfiguration error: error: mmu ppmmu3 dte write test fail
lima0: info: gp - mali400 version major 1 minor 1
lima0: info: pp0 - mali400 version major 1 minor 1
lima0: info: pp1 - mali400 version major 1 minor 1
lima0: info: pp2 - unknown version major 0 minor 0
lima0: info: pp3 - unknown version major 0 minor 0
lima0: info: l2 cache 64K, 4-way, 64byte cache line, 64bit external bus
lima0: info: bus rate = 200000000
lima0: info: mod rate = 297000000kern info: [drm] Initialized lima 1.0.0 20190217 for lima0 on minor 1
: GPU